The double switch is easy to print. And fits on the existing .... train track.
It's designed to be printed on a smaller printbed so more people can enjoy it.
After you have printed all the files with support you can start to assemble it.
first insert the slider followed by one of the switch parts.
Now you can put in the switch part connector. Warning when this is in it is hard to remove it.
At last you can push the switch handle in place